<template>
  <view>
    <view class="search-box">
      <uni-search-bar :radius="100" @confirm="serach" @input="input" cancelButton="none"></uni-search-bar>
    </view>
    <!-- 搜索建议列表-->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}} </view>
          <uni-icons type="arrowright" size="16" ></uni-icons>
      </view>
    </view>
    <!--搜索关键词-->
    <view class="history-box" v-else>
      <!--标题区域-->
      <view class="history-title">
        <text>搜素历史</text>
        <uni-icons type="trash" size="30" @click="clean"></uni-icons>
      </view>
      <!--历史区域-->
      <view class="history-list">
        <uni-tag :inverted="true" :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        //搜索关键词的历史记录
        historyList:[],
        timer: null,
        kw: '',
        //搜索的结果列表
        searchResults: []
      };
    },
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods: {
      //input输入事件函数
      input(e) {
        clearTimeout(this.timer)
        // console.log(e)
        this.timer = setTimeout(() => {
          console.log(e)
          this.kw = e
          this.getSearchList()
        }, 500)
      },
      async getSearchList() {
        //判断是否为空
        if (this.kw === '') {
          this.searchResults = []
          return
        }
        //发起请求,获取搜索建议列表
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/qsearch', {
          query: this.kw
        })//请求与输入数据相关的goods_name数据 
        if (res.meta.status != 200) return uni.$showMsg()
        this.searchResults = res.message
        console.log(res)
        
        this.saveSearchHistory()
      },
      gotoDetail(item){
        console.log(item.goods_id)
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      //存储搜索历史
      saveSearchHistory(){
        //this.historyList.push(this.kw)
        
        //将array数组转化为set对象
        const set = new Set(this.historyList)
        //调用set对象的delete方法，移除对应元素
        set.delete(this.kw)
        //调用add方法，像set中添加元素
        set.add(this.kw)
        //将set对象转化为array数组
        this.historyList = Array.from(set)
        //调用uni.setStorageSync(key,value)将搜索历史持久保存到本地
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query='+kw
        })
      },
      clean(){
        this.historyList= []
        uni.setStorageSync('kw','[]')
      }
    },
    computed:{
      //反转属性
      histories(){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
  .uni-searchbar {
    display: flex;
    flex-direction: row;
    position: relative;
    padding: 16rpx;
    background-color: #c00000;
  }

  .search-box {
    position: sticky;
    top: 0;
    z-index: 999
  }
  .sugg-list{
    padding: 0 5px;
    
    .sugg-item{
      font-size: 12px;
      padding: 13px 0;
      border-botom:1px solid #efefef;
      display: flex;
      align-items:center;
      justify-content: space-between;
      
      .goods-name{
        //文字不允许换行（单行文本）
        white-space: nowrap;
        //溢出部分隐藏
        overflow: hidden;
        //文本输出后，使用。。。代替
        text-overflow: ellipsis;
        margin-right: 3px;
      }
    }
  }
  
  .history-box{
    padding: 0 5px;
    .history-title{
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items:center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }
    .history-list{
      display: flex;
      flex-wrap: wrap;
      .uni-tag{
        color: black;
        display: block;
        margin-top: 5px;
        margin-right: 5px;
      }
     }
  }
</style>